Dynamo-electric machinery



April 1, 1924. 1,488,498

' E. B. HOFF DYNAMO ELECTRIC MACHINERY Filed May 2. 1923 2 Sheets-Sheet2 INVENTOR ATTORNEYS Patented Apr. 1,1924.

UNITED STATES EARL B. HOFF, OF EAST FACTUBING COMPANY, OF

CLEVELAND, OHIO, ASSIGNOB TO THE AZOB MOTOR MA U- CLE'VELAND, OHIO, A.CORPORATION OF OHIO DYNAIO-ELECTBIC KLCHINERY.

' Application fled Kay 2, 1923. Serial No. 636,100.

To all whomit may concern.-

Be it known that I, Emu. B. Hoar, a citizen of the United States,residingl at East Cleveland, in the county of Cuya oga and 6 State ofOhio,-have invented a certain new and useful Improvement inDynamo-Electric Machinery, of which the following is. a full, clear, andexact description, reference i being had to the accompanying drawin Thisinvention relates to dynamo-e ectric machinery, and especially to smallmotors and generators such as are often used to drive light machinerylike washing ma- -chines, ironing machines, computing ma- 18 chines, andother mechanical devices employing only a small amount of power; or orgenerating current in automobiles, motor boats, farm-appliances and thelike. Practically all sim licit and cheapness of manufacture com in witha construction which shall be largely dust and water-proof, and it isoften of advantage to secure access connections for the purpose ofreversing the a: direction of rotation, changing the speed,

etc.

The objects of this invention are the provision of aterminal block whichshall be supported from the interior of the device and pro'ect into suchrelation with the exterior o the casing as shall enable the electricconnections to be made with equal facility whether the machine beassembled or dismantled; while at the same time retainin u the featuresof simplicity, cheapness, and

ti ht enclosure.

the drawin accompanyin and forming a part of this a plication I aveshown certain simple mec nical my inventive idea can be embodied,although it will be understood that these are merely illustrative of thegeneral principles of my invention and are not exhaustive of itsapplications. Fig. 1 is a pers tive view of I a small motor rovided withmy improvements, the terminal-housing having been re moved; Fig. 2 is avertical sectional view through such a motor or dynamo showing myimproved terminal block in elevation;

Fig. 3 is a-pers tive view of the particular block' and lock supportemployed in Figs; 1 and 2; and Figs. 4 and 5 illustrate modified forms.

Describing the parts I actors, 1 represents the e of a small these usesdemand a maximum of to the internal I forms in which removable cap19 breference char- {run a hole 12 but motor or dynamo and 2-2 represent theend flan es or bells one at least of which is removab y secured thereto.3 indicates the field or stator member which is generally made of sheetiron punchings assembled together and pressedlnto the frame. shown thismember as provided at each with an insulating late 4 and transversedfrom end to end by olts 5-5 whose threaded ends project throu h theflanges or bells and receive nuts 6 w erebythe latter are secured inplace. Thus far the construction is gpical of many small motors.

e flanges or bells '22 are formed with bearings 10-10 in which isjournaled the shaft 11 which carries the rotor orarmature (not shown)and one of the bells or flanges is formed at one side of its bearingwith an aperture 12 substantially shaft through which pro ects aterminal block 13 of msulating material rigidly carried by some part ofthe motor interior. When bolts 5-5 are used a simple and convenient wayto support this block is by means of'a sheet metal bridge shown in Figs.2 and 3,, comprising end portions 14-44 apertured for the reception ofthe bolts and a middle portion 15 olded up and riveted to the blockitself which may be of rubber, fibre, porcelain, bakelite, slate, soapstone, mica or other suitable insulating material. This bridge is bestfastened in place by s acers 16 and nuts 17. In this construction theblock is so mounted as to project ed wise through the opening '12 and isprovid d with suitable contact devices such as the binding posts 18located so far beyond the frame as to project entirely through theflangewhere they can readily be manipu; lated after the latter is inplace. A removparallel to. the

I have side I able cover 19 is provided for the hole 12, a

According to a modified construction, the

bridge may be applied more nearly flatwise as shown at 24 in Fig. 4, inwhich case also the block 13, instead of being mounted edgewise, isarranged so as substantially to fill the opening 12 and to lie flushwith the surface of the flange or hell 2, a being provided as "before.

Accordingto another modification of my invention the block takes theform shown in 13 in Fig. 5, projecting flat-wise through formed at itsinner edge with a rim which contacts the inner surface of the flange 2and dispenses with the need of a separate cover. In this case I haveshown=the block as supported on a spring arm 26 screwed to the innerface of the frame. It will be obvious that many other arrangements couldbe employed.

The wiring illustrated in Fig. 2 is primarily for an induction motor,the leads 30-30 passing to the field coils 31, and the other eads 32being connected to starting coils (not shown). One advantage of thepresent arrangement is that when made in this way the different coilscan be installed and their connections completed and tested before theend flanges are attached, and after the rotor or armature is installedand the end flanges attached the starting coils can be reversed so as toreverse the direction of the rotation, or speed regulating devices canbe connected in circuit. When applied to a direct-current motor theconnections can be so arranged as to permit the reversal of rotation ora variation of its speed, or when applied to a generator the same can beadjusted for voltage, speed, or regulation rate. It is desirable thatthe axis of the hole 12 should be generally parallel to that of theshaft although it need not be strictly so as shown in F 4 and 5. Theseim provemcnts are particularly important in connection with a rotatingshaft device because of the difiiculty of removing and replacing abearing plate in such wise as to leave the bearings strictly in line,but many changes in detail can be made without departing from in Yinventive idea and I do not limit myseli except as recited in my severalclaims. K

Having thus described what I claim is:

1. In dynamo electric machinery, the combination with a frame having aremovable end member provided with a shaft my invention,

bearing and electro-Inagnetic coils inside said frame, said end memberhaving a hole at one side of said bearing, of a terminal block supportedinteriorly of said frame independently of said end member and projectingthrough said hole, and contact devices carried by said terminal blockand accessible from the exterior when said end member is in place.

2. In dynamo. electric machinery, the combination with a stator of aterminal block ri 'dly mounted relative] thereto contact evices carriedby said lock and having the stator terminals connected themto, and ahousing for said stator having a hole therein through which saidterminal block projects to a suflicient distance to afford ready accessto said contact devices.

3. In dynamo electric machinery, the combination with fixed androtatable electro-magnetic members, of a terminal block rigidly mountedrelatively to the fixed memher, a housing for said members, one part ofsaid housing being removable and having therein a bearing for therotatable member and a hole at one side of said bearin adapted for thereception of said termin block, said hole and bearing facing in the samegeneral direction, and contact devices carried by that part of theterminal block which projects outside said removable mem- 4. In dynamoelectric machinery, in combination a frame, an end member detachablysecured to said frame and having a .journal bearing and a hole at oneside of ent of said end member.

5. In dynamo electric machinery, in combination, a cylindrical casing, astationary electro-m'agnetic member rigidly mounted inside the same, anapertured member fitting slidably into the end of said casing anddetachably secured thereto, said member having a journal bearing whoseaxis is parallel to the casing axis, a shaft journaled in said bearing,a rota electro-magnetic member carried by sai shaft, a terminal blockrigid with said stationary electromagnetic member and proj through anaperture in said apert member, electric connections between saidelectromagnetic members and a portion of said block which is accessiblefrom the exterior 'of said apertured member, and: cover do tachablysecured to the outside of said apertured member and housing said block.

In testimony whereof, I hereunto afiix my

